Environmental Engineering Dictionary and Directory

Environmental Engineering Dictionary and Directory

Environmental Engineering Dictionary and Directory

337 Pages ·2001·1.41 MB ·English

Environmental Engineering Dictionary and Directory


Library of Congress Cataloging-in-Publication Data


Pankratz, Tom M.


Environmental engineering dictionary and directory / Thomas M. Pankratz.


p. cm.


ISBN 1-56670-543-6 (alk. paper)


1. Environmental engineering--Dictionaries. 2. Brand name products--Dictionaries. 3.


Trademarks--Dictionaries. 4. Environmental engineering--Directories. I. Title.


TD9 .P36 2000


628--dc21 00-044356



This book contains information obtained from authentic and highly regarded sources. Reprinted material


is quoted with permission, and sources are indicated. A wide variety of references are listed. Reasonable


efforts have been made to publish reliable data and information, but the author and the publisher cannot


assume responsibility for the validity of all materials or for the consequences of their use.


Neither this book nor any part may be reproduced or transmitted in any form or by any means, electronic


or mechanical, including photocopying, microfilming, and recording, or by any information storage or


retrieval system, without prior permission in writing from the publisher.


The consent of CRC Press LLC does not extend to copying for general distribution, for promotion, for


creating new works, or for resale. Specific permission must be obtained in writing from CRC Press LLC


for such copying.


Direct all inquiries to CRC Press LLC, 2000 N.W. Corporate Blvd., Boca Raton, Florida 33431.


Trademark Notice: Product or corporate names may be trademarks or registered trademarks, and are


used only for identification and explanation, without intent to infringe.


© 2001 by CRC Press LLC


Lewis Publishers is an imprint of CRC Press LLC


No claim to original U.S. Government works


International Standard Book Number 1-56670-543-6


Library of Congress Card Number 00-044356


Printed in the United States of America 1 2 3 4 5 6 7 8 9 0


Printed on acid-free paper



Preface


This book has been written to help professionals, students, and lay people identify


the increasing number of terms in the fields of environmental engineering and


science.


More than 8000 terms, acronyms, and abbreviations applying to wastewater,


potable water, industrial water treatment, seawater desalination, air pollution, incin-


eration, and hazardous waste remediation have been defined.


The most unique feature of this book is the inclusion of more than 3000 trade-


marks and brand names. Many of these commercial terms for proprietary products


or processes are so common or descriptive that they have fallen into general use.


This confusion is compounded by the fact that many terms contain similar prefixes


(e.g., bio-, enviro-, hydra-, hydro-, etc.) and it is often difficult to tell them apart.


This book originates from Screening Equipment Handbook, first published in


1988, whose glossary contains a list of screening-related trademarks and brand


names along with their company affiliation. Even though that list was relatively


short, a surprisingly large number of companies had come and gone or changed their


names through mergers or acquisitions. This led to an expanded directory entitled,


The Dictionary of Water and Wastewater Treatment Trademarks and Brand Names,


published in 1991, and which contained 1200 commercial terms.


The Concise Dictionary of Environmental Engineering followed in 1996. In


addition to the 2200 commercial terms, it was further expanded to include 3000


generic environmental engineering terms. Shortly after it was published, the envi-


ronmental equipment manufacturing industry began a consolidation led by USFilter,


Waterlink, Baker Hughes, ITT, F.B. Leopold, and others that has resulted in changes


to 43% of the terms included in the 1996 edition.


During the research for this book, many other books, magazines, dictionaries,


glossaries, buyer’s guides, catalogs, brochures, and technical papers were reviewed


to locate new terms and their definitions. Although there are too many references


to list, I would like to acknowledge the help of these publications and their authors.


In addition to technically reviewing this book, John B. Tonner was especially


helpful with his suggestions, advice, research assistance, and computer wizardry.


Regardless of when I would call, John was always available to help. His www.world-


wide-water.com Web site also proved to be a valuable research tool.


I would like to acknowledge the libraries that were used in my research. They


include the M.D. Anderson Library at the University of Houston, the Helen Hall


Library in League City, Texas, the Houston Public Library Central Branch, and the


library at King Fahd University of Petroleum and Mining in Dhahran, Saudi Arabia.


I also recognize USFilter and Alfa-Laval for their support.


I’m grateful for the assistance of the many friends and colleagues who suggested


new terms and challenged old ones, helped with definitions, provided encouragement,


or assisted in the book’s production. Some of these people include Robert W. Brown,


Gordon Carter, Bill Copa, Chad Dannemann, Jim Force, Jack Gardiner, Duane


Germenis, Stacie Jones, John Meidl, Mack Moore, Chad Pankratz, Bill Perpich,


Barb Petroff, Jim Symons, Mark Wilson, and Joe Zuback.


Like the first edition, published in 1996, much of my work on this book took


place while traveling; the rest was done in the evenings and weekends. I would never


have been able to finish without the continued patience and support of my wife,


Julie, and our children, Chad, Sarah, Mike, and Katie.


This book is dedicated to my wife, Julie Lynn Pankratz, and our grandson,


Gabriel R. Suarez, who was born the same day this book was completed.


Tom Pankratz




Introduction


This dictionary contains terms used in the fields of environmental engineering and


environmental science, and the definitions provided relate to their use in an envi-


ronmental context only.


The commercial terms represent company brand names or trademarks, and have


been italicized to differentiate them from the technical terms in general usage.


Whenever appropriate, the use of ™ or ® has been included following the name of


the entry, although terms may be registered trademarks even though they do not


include either symbol. It is also possible that some of the entries listed as trademarks


may not be registered or properly used by the manufacturers listed in connection


with them.


Brand names and trademarks often evolve and take different forms. Variations


in the use of capitalization, hyphens, or symbols often occur over time. The repre-


sentation of the words included in this book reflects the latest version seen in use


and are assumed to be the preferred form.


Commercial acronyms are included if they are registered trademarks or com-


monly used abbreviations of company names. Nonregistered product model numbers


and trademarks that are the same as the name of a company are not always included.


Many definitions were extrapolated from stories, advertisements, or product bro-


chures and were not directly corroborated by the company listed as being responsible


for the term.


The company name included in the definition of a commercial term usually


represents the company that manufactures that particular product or process. In some


cases, the listed company may only market, distribute, or license the product.


In several instances, the same brand name has been listed more than once to


describe different products or processes from different companies. The author is


unaware of any dispute involving these cases and is simply reporting that the


companies identified have used the term for the product described. In some cases,


the term may be dormant, obsolete, or no longer available from the company listed.


Company addresses, phone numbers, and e-mail addresses listed in the Manu-


facturer’s Directory were confirmed over a period of several years. Some contact


information may have changed, especially with the recent telephone area code


changes in many parts of the U.S. Readers are cautioned that an incorrect phone


number, address, or e-mail address does not mean that a company is no longer in


business.


There are a few cases where a company whose name is listed in a definition is


not included in the Manufacturer’s Directory. If current contact information for a


company could not be located, the out-of-date information was not included.


Terms have been arranged alphabetically using current word processing software.


In general, terms related to plumbing, household products, computer programs,


or software have not been included.


All of the terms have been listed in good faith. A reasonable attempt has been


made to confirm all definitions and, in the case of commercial terms, verify the


companies responsible for the listings. The author apologizes for any omissions or


errors.


If you are aware of any changes or additions that should be included in subse-


quent editions, please send them to Tom Pankratz, P.O. Box 75064, Houston, Texas


USA, 77234-5064.



Foreword


The areas of environmental engineering and sciences and their related business


activities have grown to the point that they overlap the professional and private lives


of almost everyone. As environmental issues become more complicated, so does the


vocabulary required to understand and discuss them. This Environmental Engineer-


ing Dictionary and Directory defines many terms that did not even exist a decade ago.


My own field of water reclamation and reuse is an example of a relatively new


area of environmental engineering that has fostered the introduction of many new


terms and technologies.


When considering advanced treatment of municipal and industrial wastewaters,


a repeated thesis has been that such a high quality effluent should be put to beneficial


use rather than simply wasted. Today, technically proven treatment and purification


processes exist to provide treated water of almost any quality desired. This offers a


realistic framework for considering water reclamation and reuse in many parts of


the world that are experiencing water shortages. Nonpotable water reuse applications,


such as agricultural and landscape irrigation, toilet flushing in large office buildings,


and water for aesthetic and environmental purposes have become major options for


planned water reuse.


Water reuse provides innovative and alternative options for agriculture, munic-


ipalities, and industries. However, water reuse is only one alternative in planning to


meet future water resource needs. Conservation, efficient management and use of


existing water supplies, and the development of new water resources based on


watershed management or seawater desalination are examples of other alternatives.


As the field of environmental engineering continues to develop, so will the


vocabulary required for its discussion and study. Our need to understand the envi-


ronment and to better appreciate our relationship with nature is greater now than at


any time in our history. Thus Tom’s book is particularly timely and relevant.


Takashi Asano, Ph.D., P.E.


Adjunct Professor


Department of Civil and Environmental Engineering


University of California at Davis



A


Å See “Angstrom (Å).”


A&I Alternative and Innovative.


A/O® Wastewater treatment process for biological removal of nitrogen by USFil-


ter/Krüger.


A2/O® Biological treatment process for phosphorus and nitrogen removal by USFil-


ter/Krüger.


A2C™ Biological wastewater treatment system by Baker Process — Municipal


Division.


A·I·R Photocatalytic process to destroy VOCs by Trojan Technologies, Inc.


AA See “atomic absorption spectrophotometry (AA).”


AAEE American Academy of Environmental Engineers.


AAP Asbestos Action Program.


AAPCO American Association of Pesticide Control Officials.


AAQS Ambient air quality standards.


AARC Alliance for Acid Rain Control.


AAS American Association for the Advancement of Science.


ABA1000® Alumina oxide for phosphate reduction by Selecto, Inc.


ABA2000® Alumina oxide for lead and heavy metals removal by Selecto, Inc.


ABA8000® Alumina oxide for fluoride removal by Selecto, Inc.


abandoned well A well whose use has been permanently discontinued or which


is in a state of such disrepair that it cannot be used for its intended purpose.


abatement Reducing the degree or intensity of, or eliminating, pollution.


abattoir A place where animals are slaughtered for their meat and meat byproducts.


ABC Filter™ Automatic backwashable cartridge filter by USFilter/Rockford.


Abcor® Ultrafiltration membrane product by Koch Membrane Systems, Inc.


ABF Activated bio-filtration wastewater treatment system by Infilco Degremont,


Inc.


ABF Traveling bridge type automatic backwashing gravity sand filter by Aqua-


Aerobic Systems, Inc.


abiocoen All of the geologic, climatic, and other nonliving elements of an eco-


system.


abiotic Nonliving elements in the environment.


ABJ™ ABJ product group of Sanitaire Corp.


ablation The combined processes of glacial melting and evaporation which results


in a net loss of ice.


ablation zone The lower part of a glacier where the net loss of ice exceeds the


net gain.


ABS (1) Acrylonitrile-butadiene-styrene. A black plastic material, used in the man-


ufacture of pipes and other components. (2) Alkyl-benzene-sulfonate. A sur-


factant formerly used in synthetic detergents that resisted biological breakdown.


absolute filter rating A filter rating which indicates that 99.9% of the particles


larger than a specified size will be removed by the filter.


absolute humidity The total amount of water vapor present in the air, measured


in grams per cubic meter.


absolute pressure The total pressure in a system, equal to the sum of the gage


pressure and atmospheric pressure.


absolute purity water Water with a specific resistance of 18.3 megohm-cm at


25°C.


absolute zero The lowest temperature possible; 0° on the Kelvin scale or approx-


imately –273°C (–459.7°F).


absorbate A substance used to soak up another substance.


absorbed dose The amount of a chemical that enters the body of an exposed


organism.


absorbent Any substance that exhibits the properties of absorption.


absorption The process of transferring molecules of gas, liquid, or a dissolved


substance to the surface of a solid where it is bound by chemical or physical


forces.


absorption field A trench or pit filled with gravel or loose rock designed to absorb


septic tank effluent.


ABW® Traveling bridge type gravity sand filter by Infilco Degremont, Inc.


abyssal zone A zone of deep oceanic waters, generally deeper than 2000 meters


and between the hadal and bathyal zones where light does not penetrate.


AC See “activated carbon.”


AC® Industrial wastewater treatment unit by Colloid Environmental Technologies


Co.


ACA American Conservation Association.


acaricide A pesticide used to kill spiders, ticks, or mites.


ACBM Asbestos-containing building material.


Accelapak® Modular water treatment plant by Infilco Degremont, Inc.


Accelator® Solids contact clarifier with primary and secondary mixing zones by


Infilco Degremont, Inc.


Accelo Hi-Cap Filter underdrain block formerly offered by Infilco Degremont,


Inc.


Accelo-Biox® Modular wastewater treatment plant by Infilco Degremont, Inc.


Accel-o-Fac™ Sewage treatment plant design by Lake Aid Systems.


acceptable risk The level of risk associated with minimal adverse effects, usually


determined by a risk analysis.


Access Analytical Former name of IDEXX Laboratories, Inc.


accessory species Species found in less than half but more than one quarter of the


area covered by a plant community.


accident site The location of an unexpected occurrence, failure or loss, either at


a plant or along a transportation route, resulting in a release of hazardous


materials.


acclimatization The physiological and behavioral adjustments of an organism to


changes in its environment.


Accofloc® Ion exchange media by Colloid Environmental Technologies Co.



Library of Congress Cataloging-in-Publication Data


Pankratz, Tom M.


Environmental engineering dictionary and directory / Thomas M. Pankratz.


p. cm.


ISBN 1-56670-543-6 (alk. paper)


1. Environmental engineering--Dictionaries. 2. Brand name products--Dictionaries. 3.


Trademarks--Dictionaries. 4. Environmental engineering--Directories. I. Title.


TD9 .P36 2000


628--dc21 00-044356



This book contains information obtained from authentic and highly regarded sources. Reprinted material


is quoted with permission, and sources are indicated. A wide variety of references are listed. Reasonable


efforts have been made to publish reliable data and information, but the author and the publisher cannot


assume responsibility for the validity of all materials or for the consequences of their use.


Neither this book nor any part may be reproduced or transmitted in any form or by any means, electronic


or mechanical, including photocopying, microfilming, and recording, or by any information storage or


retrieval system, without prior permission in writing from the publisher.


The consent of CRC Press LLC does not extend to copying for general distribution, for promotion, for


creating new works, or for resale. Specific permission must be obtained in writing from CRC Press LLC


for such copying.


Direct all inquiries to CRC Press LLC, 2000 N.W. Corporate Blvd., Boca Raton, Florida 33431.


Trademark Notice: Product or corporate names may be trademarks or registered trademarks, and are


used only for identification and explanation, without intent to infringe.


© 2001 by CRC Press LLC


Lewis Publishers is an imprint of CRC Press LLC


No claim to original U.S. Government works


International Standard Book Number 1-56670-543-6


Library of Congress Card Number 00-044356


Printed in the United States of America 1 2 3 4 5 6 7 8 9 0


Printed on acid-free paper



Preface


This book has been written to help professionals, students, and lay people identify


the increasing number of terms in the fields of environmental engineering and


science.


More than 8000 terms, acronyms, and abbreviations applying to wastewater,


potable water, industrial water treatment, seawater desalination, air pollution, incin-


eration, and hazardous waste remediation have been defined.


The most unique feature of this book is the inclusion of more than 3000 trade-


marks and brand names. Many of these commercial terms for proprietary products


or processes are so common or descriptive that they have fallen into general use.


This confusion is compounded by the fact that many terms contain similar prefixes


(e.g., bio-, enviro-, hydra-, hydro-, etc.) and it is often difficult to tell them apart.


This book originates from Screening Equipment Handbook, first published in


1988, whose glossary contains a list of screening-related trademarks and brand


names along with their company affiliation. Even though that list was relatively


short, a surprisingly large number of companies had come and gone or changed their


names through mergers or acquisitions. This led to an expanded directory entitled,


The Dictionary of Water and Wastewater Treatment Trademarks and Brand Names,


published in 1991, and which contained 1200 commercial terms.


The Concise Dictionary of Environmental Engineering followed in 1996. In


addition to the 2200 commercial terms, it was further expanded to include 3000


generic environmental engineering terms. Shortly after it was published, the envi-


ronmental equipment manufacturing industry began a consolidation led by USFilter,


Waterlink, Baker Hughes, ITT, F.B. Leopold, and others that has resulted in changes


to 43% of the terms included in the 1996 edition.


During the research for this book, many other books, magazines, dictionaries,


glossaries, buyer’s guides, catalogs, brochures, and technical papers were reviewed


to locate new terms and their definitions. Although there are too many references


to list, I would like to acknowledge the help of these publications and their authors.


In addition to technically reviewing this book, John B. Tonner was especially


helpful with his suggestions, advice, research assistance, and computer wizardry.


Regardless of when I would call, John was always available to help. His www.world-


wide-water.com Web site also proved to be a valuable research tool.


I would like to acknowledge the libraries that were used in my research. They


include the M.D. Anderson Library at the University of Houston, the Helen Hall


Library in League City, Texas, the Houston Public Library Central Branch, and the


library at King Fahd University of Petroleum and Mining in Dhahran, Saudi Arabia.


I also recognize USFilter and Alfa-Laval for their support.


I’m grateful for the assistance of the many friends and colleagues who suggested


new terms and challenged old ones, helped with definitions, provided encouragement,


or assisted in the book’s production. Some of these people include Robert W. Brown,


Gordon Carter, Bill Copa, Chad Dannemann, Jim Force, Jack Gardiner, Duane


Germenis, Stacie Jones, John Meidl, Mack Moore, Chad Pankratz, Bill Perpich,


Barb Petroff, Jim Symons, Mark Wilson, and Joe Zuback.


Like the first edition, published in 1996, much of my work on this book took


place while traveling; the rest was done in the evenings and weekends. I would never


have been able to finish without the continued patience and support of my wife,


Julie, and our children, Chad, Sarah, Mike, and Katie.


This book is dedicated to my wife, Julie Lynn Pankratz, and our grandson,


Gabriel R. Suarez, who was born the same day this book was completed.


Tom Pankratz




Introduction


This dictionary contains terms used in the fields of environmental engineering and


environmental science, and the definitions provided relate to their use in an envi-


ronmental context only.


The commercial terms represent company brand names or trademarks, and have


been italicized to differentiate them from the technical terms in general usage.


Whenever appropriate, the use of ™ or ® has been included following the name of


the entry, although terms may be registered trademarks even though they do not


include either symbol. It is also possible that some of the entries listed as trademarks


may not be registered or properly used by the manufacturers listed in connection


with them.


Brand names and trademarks often evolve and take different forms. Variations


in the use of capitalization, hyphens, or symbols often occur over time. The repre-


sentation of the words included in this book reflects the latest version seen in use


and are assumed to be the preferred form.


Commercial acronyms are included if they are registered trademarks or com-


monly used abbreviations of company names. Nonregistered product model numbers


and trademarks that are the same as the name of a company are not always included.


Many definitions were extrapolated from stories, advertisements, or product bro-


chures and were not directly corroborated by the company listed as being responsible


for the term.


The company name included in the definition of a commercial term usually


represents the company that manufactures that particular product or process. In some


cases, the listed company may only market, distribute, or license the product.


In several instances, the same brand name has been listed more than once to


describe different products or processes from different companies. The author is


unaware of any dispute involving these cases and is simply reporting that the


companies identified have used the term for the product described. In some cases,


the term may be dormant, obsolete, or no longer available from the company listed.


Company addresses, phone numbers, and e-mail addresses listed in the Manu-


facturer’s Directory were confirmed over a period of several years. Some contact


information may have changed, especially with the recent telephone area code


changes in many parts of the U.S. Readers are cautioned that an incorrect phone


number, address, or e-mail address does not mean that a company is no longer in


business.


There are a few cases where a company whose name is listed in a definition is


not included in the Manufacturer’s Directory. If current contact information for a


company could not be located, the out-of-date information was not included.


Terms have been arranged alphabetically using current word processing software.


In general, terms related to plumbing, household products, computer programs,


or software have not been included.


All of the terms have been listed in good faith. A reasonable attempt has been


made to confirm all definitions and, in the case of commercial terms, verify the


companies responsible for the listings. The author apologizes for any omissions or


errors.


If you are aware of any changes or additions that should be included in subse-


quent editions, please send them to Tom Pankratz, P.O. Box 75064, Houston, Texas


USA, 77234-5064.



Foreword


The areas of environmental engineering and sciences and their related business


activities have grown to the point that they overlap the professional and private lives


of almost everyone. As environmental issues become more complicated, so does the


vocabulary required to understand and discuss them. This Environmental Engineer-


ing Dictionary and Directory defines many terms that did not even exist a decade ago.


My own field of water reclamation and reuse is an example of a relatively new


area of environmental engineering that has fostered the introduction of many new


terms and technologies.


When considering advanced treatment of municipal and industrial wastewaters,


a repeated thesis has been that such a high quality effluent should be put to beneficial


use rather than simply wasted. Today, technically proven treatment and purification


processes exist to provide treated water of almost any quality desired. This offers a


realistic framework for considering water reclamation and reuse in many parts of


the world that are experiencing water shortages. Nonpotable water reuse applications,


such as agricultural and landscape irrigation, toilet flushing in large office buildings,


and water for aesthetic and environmental purposes have become major options for


planned water reuse.


Water reuse provides innovative and alternative options for agriculture, munic-


ipalities, and industries. However, water reuse is only one alternative in planning to


meet future water resource needs. Conservation, efficient management and use of


existing water supplies, and the development of new water resources based on


watershed management or seawater desalination are examples of other alternatives.


As the field of environmental engineering continues to develop, so will the


vocabulary required for its discussion and study. Our need to understand the envi-


ronment and to better appreciate our relationship with nature is greater now than at


any time in our history. Thus Tom’s book is particularly timely and relevant.


Takashi Asano, Ph.D., P.E.


Adjunct Professor


Department of Civil and Environmental Engineering


University of California at Davis



A


Å See “Angstrom (Å).”


A&I Alternative and Innovative.


A/O® Wastewater treatment process for biological removal of nitrogen by USFil-


ter/Krüger.


A2/O® Biological treatment process for phosphorus and nitrogen removal by USFil-


ter/Krüger.


A2C™ Biological wastewater treatment system by Baker Process — Municipal


Division.


A·I·R Photocatalytic process to destroy VOCs by Trojan Technologies, Inc.


AA See “atomic absorption spectrophotometry (AA).”


AAEE American Academy of Environmental Engineers.


AAP Asbestos Action Program.


AAPCO American Association of Pesticide Control Officials.


AAQS Ambient air quality standards.


AARC Alliance for Acid Rain Control.


AAS American Association for the Advancement of Science.


ABA1000® Alumina oxide for phosphate reduction by Selecto, Inc.


ABA2000® Alumina oxide for lead and heavy metals removal by Selecto, Inc.


ABA8000® Alumina oxide for fluoride removal by Selecto, Inc.


abandoned well A well whose use has been permanently discontinued or which


is in a state of such disrepair that it cannot be used for its intended purpose.


abatement Reducing the degree or intensity of, or eliminating, pollution.


abattoir A place where animals are slaughtered for their meat and meat byproducts.


ABC Filter™ Automatic backwashable cartridge filter by USFilter/Rockford.


Abcor® Ultrafiltration membrane product by Koch Membrane Systems, Inc.


ABF Activated bio-filtration wastewater treatment system by Infilco Degremont,


Inc.


ABF Traveling bridge type automatic backwashing gravity sand filter by Aqua-


Aerobic Systems, Inc.


abiocoen All of the geologic, climatic, and other nonliving elements of an eco-


system.


abiotic Nonliving elements in the environment.


ABJ™ ABJ product group of Sanitaire Corp.


ablation The combined processes of glacial melting and evaporation which results


in a net loss of ice.


ablation zone The lower part of a glacier where the net loss of ice exceeds the


net gain.


ABS (1) Acrylonitrile-butadiene-styrene. A black plastic material, used in the man-


ufacture of pipes and other components. (2) Alkyl-benzene-sulfonate. A sur-


factant formerly used in synthetic detergents that resisted biological breakdown.


absolute filter rating A filter rating which indicates that 99.9% of the particles


larger than a specified size will be removed by the filter.


absolute humidity The total amount of water vapor present in the air, measured


in grams per cubic meter.


absolute pressure The total pressure in a system, equal to the sum of the gage


pressure and atmospheric pressure.


absolute purity water Water with a specific resistance of 18.3 megohm-cm at


25°C.


absolute zero The lowest temperature possible; 0° on the Kelvin scale or approx-


imately –273°C (–459.7°F).


absorbate A substance used to soak up another substance.


absorbed dose The amount of a chemical that enters the body of an exposed


organism.


absorbent Any substance that exhibits the properties of absorption.


absorption The process of transferring molecules of gas, liquid, or a dissolved


substance to the surface of a solid where it is bound by chemical or physical


forces.


absorption field A trench or pit filled with gravel or loose rock designed to absorb


septic tank effluent.


ABW® Traveling bridge type gravity sand filter by Infilco Degremont, Inc.


abyssal zone A zone of deep oceanic waters, generally deeper than 2000 meters


and between the hadal and bathyal zones where light does not penetrate.


AC See “activated carbon.”


AC® Industrial wastewater treatment unit by Colloid Environmental Technologies


Co.


ACA American Conservation Association.


acaricide A pesticide used to kill spiders, ticks, or mites.


ACBM Asbestos-containing building material.


Accelapak® Modular water treatment plant by Infilco Degremont, Inc.


Accelator® Solids contact clarifier with primary and secondary mixing zones by


Infilco Degremont, Inc.


Accelo Hi-Cap Filter underdrain block formerly offered by Infilco Degremont,


Inc.


Accelo-Biox® Modular wastewater treatment plant by Infilco Degremont, Inc.


Accel-o-Fac™ Sewage treatment plant design by Lake Aid Systems.


acceptable risk The level of risk associated with minimal adverse effects, usually


determined by a risk analysis.


Access Analytical Former name of IDEXX Laboratories, Inc.


accessory species Species found in less than half but more than one quarter of the


area covered by a plant community.


accident site The location of an unexpected occurrence, failure or loss, either at


a plant or along a transportation route, resulting in a release of hazardous


materials.


acclimatization The physiological and behavioral adjustments of an organism to


changes in its environment.


Accofloc® Ion exchange media by Colloid Environmental Technologies Co.


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